如何将特定对象值推送到数组中

Question

我有带键的对象，我只想向数组添加特定值。例如给定的钥匙[3248647, 32486481]{  "32486479": {    "id": "32486479",    "lat": 33,    "lng": 73,    "accuracy": 51,    "updated_at": 1570908416  },  "32486480": {    "id": "32486480",    "lat": 33,    "lng": 73,    "accuracy": 51,    "updated_at": 1570908416  },  "32486481": {    "id": "32486481",    "lat": 33,    "lng": 73,    "accuracy": 51,    "updated_at": 1570908416  },预期结果应该是[{    "id": "3248647",    "lat": 33,    "lng": 73,    "accuracy": 51,    "updated_at": 1570908416,},{    "id": "32486481",    "lat": 33,    "lng": 73,    "accuracy": 51,    "updated_at": 1570908416  }]

Answer 1

keys.map(k => obj[k])

const keys = [32486479, 32486481];

const obj = { "32486479": { "id": "32486479", "lat": 33, "lng": 73, "accuracy": 51, "updated_at": 1570908416 }, "32486480": { "id": "32486480", "lat": 33, "lng": 73, "accuracy": 51, "updated_at": 1570908416 }, "32486481": { "id": "32486481", "lat": 33, "lng": 73, "accuracy": 51, "updated_at": 1570908416 }};

console.log(keys.map(k => obj[k]))

Answer 2

您可以使用 Array.map方法执行此操作：

const ids = [32486479, 32486481]

const data = {

  "32486479": {

    "id": "32486479",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  },

  "32486480": {

    "id": "32486480",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  },

  "32486481": {

    "id": "32486481",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  }

}

const expectedResult = [{

    "id": "32486479",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416,

},{

    "id": "32486481",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  }]

  

 const actualResult = ids

   // loop on the ids array and use them to access object inside data

   .map(id => data[String(id)])

   // filter falsy value

   .filter(Boolean);

 

 console.log(actualResult);

Answer 3

您可以使用 Array.map方法执行此操作：

const ids = [32486479, 32486481]

const data = {

  "32486479": {

    "id": "32486479",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  },

  "32486480": {

    "id": "32486480",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  },

  "32486481": {

    "id": "32486481",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  }

}

const expectedResult = [{

    "id": "32486479",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416,

},{

    "id": "32486481",

    "lat": 33,

    "lng": 73,

    "accuracy": 51,

    "updated_at": 1570908416

  }]

  

 const actualResult = ids

   // loop on the ids array and use them to access object inside data

   .map(id => data[String(id)])

   // filter falsy value

   .filter(Boolean);

 

 console.log(actualResult);